app/static/styles.css

:root {
    --bg-color: #050505;
    --panel-bg: rgba(25, 25, 28, 0.4);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent-1: #ff2a5f;
    --accent-2: #4a00e0;
    --accent-glow: #08f7fe;
    --font-heading: 'Syne', sans-serif;
    --font-body: 'Epilogue', sans-serif;
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
    padding: 2rem;
}

/* Subtle Film Grain */
.noise-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
    z-index: 50;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Background Ambient Glowing Orbs */
.ambient-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.4;
    z-index: -1;
    animation: float 12s infinite alternate ease-in-out;
}
.glow-1 {
    width: 450px; height: 450px;
    background: radial-gradient(circle, var(--accent-1), transparent 70%);
    top: -100px; left: -150px;
}
.glow-2 {
    width: 550px; height: 550px;
    background: radial-gradient(circle, var(--accent-2), transparent 70%);
    bottom: -150px; right: -150px;
    animation-delay: -6s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(40px, 60px) scale(1.1); }
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    padding: 3.5rem;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 40px 80px rgba(0,0,0,0.6), inset 0 0 0 1px rgba(255,255,255,0.05);
    z-index: 10;
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.5s ease;
}

@keyframes slideUp {
    to { opacity: 1; transform: translateY(0); }
}

header {
    margin-bottom: 2.5rem;
    text-align: left;
}

.badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
}

h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: 1.2rem;
    letter-spacing: -0.04em;
}

.text-gradient {
    background: linear-gradient(135deg, #fff, var(--accent-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    position: relative;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.6;
}

.input-wrapper {
    margin-bottom: 1.8rem;
}

.input-wrapper label {
    display: block;
    margin-bottom: 0.6rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* File Drag & Drop */
.file-drop-area {
    position: relative;
    border: 1.5px dashed rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 3rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.3);
    cursor: pointer;
    overflow: hidden;
}

.file-drop-area:hover, .file-drop-area.dragover {
    border-color: var(--accent-glow);
    background: rgba(8, 247, 254, 0.03);
    box-shadow: inset 0 0 20px rgba(8, 247, 254, 0.05);
}

.file-drop-area.has-file {
    border-style: solid;
    border-color: var(--accent-1);
    background: rgba(255, 42, 95, 0.05);
}

.file-drop-area svg {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    transition: color 0.3s, transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.file-drop-area:hover svg {
    color: var(--text-primary);
    transform: translateY(-5px);
}

.file-message {
    display: block;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.highlight {
    color: var(--text-primary);
    font-weight: 500;
    text-decoration: underline;
    text-decoration-color: rgba(255,255,255,0.4);
    text-underline-offset: 4px;
}

.file-drop-area input[type="file"] {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Custom Select */
.custom-select {
    position: relative;
}

.custom-select select {
    width: 100%;
    appearance: none;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 1.2rem 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.custom-select select:focus {
    outline: none;
    border-color: var(--accent-glow);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 0 4px rgba(8, 247, 254, 0.1);
}

.custom-select::after {
    content: '';
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    pointer-events: none;
}

.custom-select select option {
    background: #111;
    color: var(--text-primary);
    padding: 1rem;
}

/* Submit Button */
button[type="submit"] {
    width: 100%;
    position: relative;
    background: var(--text-primary);
    color: var(--bg-color);
    border: none;
    padding: 1.2rem;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 12px;
    cursor: pointer;
    overflow: hidden;
    margin-top: 1rem;
    transition: transform 0.2s, background 0.3s;
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    background: #e2e2e2;
}

button[type="submit"]:active {
    transform: translateY(1px);
}

button[type="submit"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-glow {
    position: absolute;
    top: 0; left: -100%;
    width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
    transform: skewX(-20deg);
    transition: 0.5s;
}

button[type="submit"]:hover .btn-glow {
    left: 150%;
    transition: 0.7s;
}

/* Toggle Switch */
.toggle-row {
    margin-top: 0.5rem;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    flex-shrink: 0;
    transition: all 0.3s;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toggle-label input:checked + .toggle-switch {
    background: rgba(8, 247, 254, 0.15);
    border-color: var(--accent-glow);
}

.toggle-label input:checked + .toggle-switch::after {
    left: 23px;
    background: var(--accent-glow);
    box-shadow: 0 0 8px rgba(8, 247, 254, 0.5);
}

.toggle-text {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-hint {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Loading State */
#loading {
    margin-top: 3rem;
    text-align: center;
    animation: fadeIn 0.5s forwards;
}

.cyber-spinner {
    position: relative;
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
}

.cyber-spinner .ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid transparent;
}

.cyber-spinner .ring:nth-child(1) {
    border-top-color: var(--accent-1);
    border-left-color: var(--accent-1);
    animation: spin1 1s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}

.cyber-spinner .ring:nth-child(2) {
    border-bottom-color: var(--accent-glow);
    border-right-color: var(--accent-glow);
    animation: spin2 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}

@keyframes spin1 { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes spin2 { 0% { transform: rotate(0deg); } 100% { transform: rotate(-360deg); } }

.loading-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 500;
}

/* Results State */
#result {
    margin-top: 1rem;
    text-align: center;
    animation: fadeIn 0.6s forwards;
}

.success-icon {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: rgba(8, 247, 254, 0.1);
    color: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    border: 1px solid rgba(8, 247, 254, 0.2);
}

#result h3 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 2rem;
    font-weight: 700;
}

.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
}

.download-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.download-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.lang-tag {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    background: var(--text-primary);
    color: var(--bg-color);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.dl-text {
    font-size: 0.95rem;
    font-weight: 500;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    body { padding: 0; }
    .glass-panel { 
        padding: 2.5rem 2rem; 
        border-radius: 0; 
        border: none; 
        min-height: 100vh;
        box-shadow: none;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    h1 { font-size: 2.8rem; }
    .download-grid { grid-template-columns: 1fr; }
}